[INFO] updating cached repository rustyhorde/mussh
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/rustyhorde/mussh
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/rustyhorde/mussh" "work/ex/beta-1.38-1/sources/1.37.0/gh/rustyhorde/mussh"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/rustyhorde/mussh'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rustyhorde/mussh" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rustyhorde/mussh"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rustyhorde/mussh'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7f5ad7b96e2681461dd19057098c161946c198aa
[INFO] sha for GitHub repo rustyhorde/mussh: 7f5ad7b96e2681461dd19057098c161946c198aa
[INFO] validating manifest of rustyhorde/mussh on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of rustyhorde/mussh on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing rustyhorde/mussh
[INFO] finished frobbing rustyhorde/mussh
[INFO] frobbed toml for rustyhorde/mussh written to work/ex/beta-1.38-1/sources/1.37.0/gh/rustyhorde/mussh/Cargo.toml
[INFO] started frobbing rustyhorde/mussh
[INFO] finished frobbing rustyhorde/mussh
[INFO] frobbed toml for rustyhorde/mussh written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rustyhorde/mussh/Cargo.toml
[INFO] crate rustyhorde/mussh already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rustyhorde/mussh against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rustyhorde/mussh:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] e8c577dbc1cb066889a56f272d4e125682d2e9ee83a693596b0c711546fb1e07
[INFO] running `"docker" "start" "-a" "e8c577dbc1cb066889a56f272d4e125682d2e9ee83a693596b0c711546fb1e07"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling cc v1.0.37
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling pkg-config v0.3.14
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling serde v1.0.92
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling slog v2.4.1
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling byteorder v1.3.1
[INFO] [stderr]    Compiling memchr v2.2.0
[INFO] [stderr]    Compiling unicode-width v0.1.5
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling lazy_static v1.2.0
[INFO] [stderr]    Compiling ansi_term v0.11.0
[INFO] [stderr]    Compiling vec_map v0.8.1
[INFO] [stderr]    Compiling cfg-if v0.1.9
[INFO] [stderr]    Compiling linked-hash-map v0.5.2
[INFO] [stderr]    Compiling indexmap v1.0.2
[INFO] [stderr]    Compiling fallible-iterator v0.2.0
[INFO] [stderr]    Compiling fallible-streaming-iterator v0.1.9
[INFO] [stderr]    Compiling take_mut v0.2.2
[INFO] [stderr]    Compiling wait_group v0.1.4
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling thread_local v0.3.6
[INFO] [stderr]    Compiling lru-cache v0.1.2
[INFO] [stderr]    Compiling libsqlite3-sys v0.14.0
[INFO] [stderr]    Compiling slog-try v0.2.0
[INFO] [stderr]    Compiling slog-async v2.3.0
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling time v0.1.42
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling isatty v0.1.9
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling openssl-sys v0.9.47
[INFO] [stderr]    Compiling libssh2-sys v0.2.11
[INFO] [stderr]    Compiling term v0.5.2
[INFO] [stderr]    Compiling rusqlite v0.18.0
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling slog-term v2.4.0
[INFO] [stderr]    Compiling ssh2 v0.3.3
[INFO] [stderr]    Compiling getset v0.0.7
[INFO] [stderr]    Compiling serde_derive v1.0.92
[INFO] [stderr]    Compiling toml v0.5.1
[INFO] [stderr]    Compiling libmussh v1.0.1
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/libmussh-1.0.1/src/lib.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(crate_visibility_modifier, try_from)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `libmussh`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e8c577dbc1cb066889a56f272d4e125682d2e9ee83a693596b0c711546fb1e07"`
[INFO] running `"docker" "rm" "-f" "e8c577dbc1cb066889a56f272d4e125682d2e9ee83a693596b0c711546fb1e07"`
[INFO] [stdout] e8c577dbc1cb066889a56f272d4e125682d2e9ee83a693596b0c711546fb1e07